Aeroplane



A. AHLBRECHT.

AEROPLANE.

APPLICATION HLED MAY 15. 1920.

Patented Dec. 14, 1920.

UNITED STATES AUGUST AHLBRECHT, OF PITTSBURGH, PENNSYLVANIA.

AEROPLANE.

Specification of Letters Patent.

Patented Dec. 14, 1920.

Application led May 15, 1920. Serial No. 381,726.

To all whom it may concern:

Be it known that I, AUGUST AHLnncrrr, a citizen of the United States,residing at Pittsburgh, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inAeroplanes, of which the following is a specilication.

This invention relates to aeroplanes, more particularly to theconstruction of bi-planes of the tvpe described in my application forLetters Patent filed March 27th, 1919, Serial No. 285,536, and besidesembodying the objects and advantages as set forth in connection with theconstruction embodied in said application, has for its further object toimprove the balancing planes whereby tilting of the aerial vessel willbe reduced to a minimum especially while descending.

Further objects of the invention are to provide an aerial vessel of thecharacter stated, in a manner as hereinafter set forth which is simplein its construction and arrangement, strong, durable and eficient in itsuse, readily set up, and comparatively inexpensive to manufacture.

To the accomplishment of these and such other objects as may hereinafterappear, the invention consists of the novel construction, combinationand arrangement of parts herein specifically described and illustratedin the accompanying drawing wherein is shown an embodiment of theinvention, but it is to be understood that changes, variations andmodifications can be resorted to which come within the scope of theclaims hereunto appended.

In the drawing forming a portion of this specification and wherein likenumerals of reference designate corresponding parts throughout theseveral views:

Figure 1 is a perspective view of aeroplane planes in accordance withthis invention. Fig. 2 is a side view thereof, and Fig. 3 a view on lineIII-III, Fig. 2.

Referring to the drawing in detail 1 denotes an upper sustaining planeand 2 a lower sustaining plane, the latter being of less length than theformer. The end portions 3 of the lower plane 2 extend upwardly at aninclination and are provided with an opening 4. The end portions 3 aredisposed at opposite inclinations relative to each other. Suitableframing structures are provided for the planes and frame element-s 5 arealso provided for maintaining the planes spaced from each other, as wellas supporting and bracing them. The upper plane 1 extends beyond the endportions 3 of the lower plane 2.

Interposed between the planes 1 and 2, centrally thereof and spaced fromeach of said planes, is a substantially V-shaped balancing plane 6having each of its wings formed with an opening 7. The angulardisposition of the wings of the balancing plane 6 is identical to theangular disposition of respective end portions 3 of the lower sustainingplane 2. Each of the openings of the balancing plane 6 is in alinementwith an opening i in an end portion 3 of the lower plane 2.

The plane 1, centrally thereof, has an opening from which extendsupwardly a vertical sleeve 8, and a pair of openings from each of whichextends a sleeve 9. The sleeves 9 are of less diameter and height thanthe sleeve 8 and are arranged at respective sides of the latter over thebalancing plane Y6. The openings in the plane 1 in connection with thesleeves 8 and 9 tend to prevent tilting as they permit of the passage ofinduced currents of air, and are associated with the openings 4: and 7which also provide for the passage of currents of air.

What I claim is:

1. An aeroplane comprising a pair of sustaining planes, one arrangedover the other, a balancing plane interposed between and spaced from thesustaining planes, said balancing plane being V-shaped and having eachof its wings provided with an opening, one of said sustaining planeshaving opene ings arranged over the balancing plane, and the other ofsaid sustaining planes having inclined end portions each having anopening.

2. An aeroplane comprising an upper and a lower sustaining plane, saidupper plane having a series of openings and sleeves extending from theopenings, a balancing plane arranged between the sustaining planes andprovided with openings, said lower plane having inclined end portionseach provided with an opening.

3. In an aeroplane, an upper and a lower sustaining plane, said upperplane having a series of openings and sleeves extending from theopenings, a V-shaped balancing plane arranged between the sustainingplanes and provided with openings, said lower plane having inclined endportions each provided with an opening, and said 10 upper planeextending beyond the'end portion of the said lower plane. i

In testimony whereof I aiiix mv signature.

AUGUST AHLB'RECHT.

